diff --git a/.gitignore b/.gitignore
index c08ee2f..94ec162 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ Buildlog-*\.txt
 LaunchSettings.json
 
 .vs/
+.vscode
 Nuget/
 packages/
 
diff --git a/src/ism7mqtt/ISM7/Ism7Client.cs b/src/ism7mqtt/ISM7/Ism7Client.cs
index 4963173..25c2b60 100644
--- a/src/ism7mqtt/ISM7/Ism7Client.cs
+++ b/src/ism7mqtt/ISM7/Ism7Client.cs
@@ -30,6 +30,7 @@ public class Ism7Client
         private int _nextBundleId = 0;
         private short _lastKeepAlive = 0;
         private Stream _sslStream;
+        private int _nextSequenceId = 1;
 
         public int Interval { get; set; }
 
@@ -246,6 +247,7 @@ private async Task SubscribeAsync(string busAddress, CancellationToken cancellat
             {
                 infoRead.BusAddress = busAddress;
                 infoRead.Intervall = Interval;
+                infoRead.Seq = NextSequenceId();
             }
             await SendAsync(new TelegramBundleReq
             {
@@ -289,6 +291,7 @@ private async Task LoadInitialValuesAsync(CancellationToken cancellationToken)
                 foreach (var infoRead in infoReads)
                 {
                     infoRead.BusAddress = busAddress;
+                    infoRead.Seq = NextSequenceId();
                 }
                 await SendAsync(new TelegramBundleReq
                 {
@@ -378,6 +381,12 @@ private string NextBundleId()
             return id.ToString();
         }
 
+        private string NextSequenceId()
+        {
+            var id = Interlocked.Increment(ref _nextSequenceId);
+            return $"A;{id}";
+        }
+
         private IResponse Deserialize(PayloadType type, Stream data)
         {
             switch (type)
diff --git a/src/ism7mqtt/ISM7/Protocol/Utf8StringWriter .cs b/src/ism7mqtt/ISM7/Protocol/Utf8StringWriter .cs
new file mode 100644
index 0000000..54f3db4
--- /dev/null
+++ b/src/ism7mqtt/ISM7/Protocol/Utf8StringWriter .cs	
@@ -0,0 +1,7 @@
+using System.IO;
+using System.Text;
+
+public sealed class Utf8StringWriter : StringWriter
+{
+    public override Encoding Encoding => Encoding.UTF8;
+}
\ No newline at end of file
diff --git a/src/ism7mqtt/ISM7/Protocol/XmlPayload.cs b/src/ism7mqtt/ISM7/Protocol/XmlPayload.cs
index c7e9974..3d628c0 100644
--- a/src/ism7mqtt/ISM7/Protocol/XmlPayload.cs
+++ b/src/ism7mqtt/ISM7/Protocol/XmlPayload.cs
@@ -13,7 +13,7 @@ public abstract class XmlPayload : IPayload
 
         public byte[] Serialize()
         {
-            using var sw = new StringWriter();
+            using var sw = new Utf8StringWriter();
             var xmlWriter = XmlWriter.Create(sw, new XmlWriterSettings {Indent = false});
 
             var serializer = _serializers.GetOrAdd(GetType(), x => new XmlSerializer(x));